treewide: Switch DEFINE_TIMER callbacks to struct timer_list *

This changes all DEFINE_TIMER() callbacks to use a struct timer_list
pointer instead of unsigned long. Since the data argument has already been
removed, none of these callbacks are using their argument currently, so
this renames the argument to "unused".

Done using the following semantic patch:

@match_define_timer@
declarer name DEFINE_TIMER;
identifier _timer, _callback;
@@

 DEFINE_TIMER(_timer, _callback);

@change_callback depends on match_define_timer@
identifier match_define_timer._callback;
type _origtype;
identifier _origarg;
@@

 void
-_callback(_origtype _origarg)
+_callback(struct timer_list *unused)
 { ... }

Signed-off-by: Kees Cook <keescook@chromium.org>

drivers/xen/grant-table.c

@@ -358,10 +358,10 @@ struct deferred_entry {
 	struct page *page;
 };
 static LIST_HEAD(deferred_list);
-static void gnttab_handle_deferred(unsigned long);
+static void gnttab_handle_deferred(struct timer_list *);
 static DEFINE_TIMER(deferred_timer, gnttab_handle_deferred);
 
-static void gnttab_handle_deferred(unsigned long unused)
+static void gnttab_handle_deferred(struct timer_list *unused)
 {
 	unsigned int nr = 10;
 	struct deferred_entry *first = NULL;